n_limerinos1970 {HYDROCAL}

Compute grain roughness following Limerinos (1970)

Description

n_limerinos1970 calculate Manning's n using the Limerinos (1970) method for estimating grain roughness

Usage

n_limerinos1970(radius, grain, restrict = TRUE)

Arguments

radius

hydraulic radius (R) in meters. The original model was calibrated for 0.31 m < R < 3.32 m.

grain

grain size (d84) in millimeters. The original model was calibrated for 19 mm < d84 < 747 mm

restrict

allows for function parameters to restrict certain values. Type bool. Default TRUE.

Value

Manning's n

References

Limerinos, J. T. 1970. Determination of the Manning Coefficient from Measured Bed Roughness in Natural Channels. Water Supply Paper 1898-B. USGS, Washington, DC.

Examples

# Result: Manning's n of 0.036
n_limerinos1970(1,100)

# Result: Manning's n of 0.031
n_limerinos1970(2.5,70)

# Result: Manning's n of 0.039
n_limerinos1970(3,200)

# Result: Manning's n of 0.039
n_limerinos1970(3,200)

# Result: Grain must be within 19 and 747 mm.
n_limerinos1970(3,1000)